Error in using a new system call

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Hi everybody, as you can guess, I need your help!
First of all, I'm using a linux montavista pro 3.1 (kernel 2.4.20) for a cross compilation.
For my project, I had to develop some new system calls. This done, I wrote a C/C++ proj 
that uses this new features. 
Everything is ok during compile time but when linking, I get the following error messages.
Below you'll find only one link error cause the message is the same for each new system call used.
I don't understand what goes wrong... So I give you what I modified in the linux montavista sources and
the changes in the target file system.
Do I need to add a library for the compile time? 

/**************/
/* LINK ERROR 
/**************/
ppc_405-g++ -static -L/myWorks/en-cours/target/usr/lib -o ssc.exe libSsc.a -lpthread -lposixtime
libSsc.a(ppcbsos2.o)(.text+0x0): In function `prs_sysClkUtils':
/myWorks/en-cours/target/usr/include/sys/user_prs_sysclkutils.h:6: définitions multiples de « prs_sysClkUtils »
libSsc.a(ppcbsos1.o)(.text+0x6c):/myWorks/en-cours/target/usr/include/sys/user_prs_sysclkutils.h:6: défini pour la première fois ici

/*******************************************/
/* "montavista/arch/ppc/prs/prs_sysClkUtils.c":
/* this is the system call source file added in 
/* montavista src
/*******************************************/ 
#include <linux/prs_sysclkutils.h>

static int sysClkRunning = FALSE;
static unsigned int pitCountVal = -1;  	        /* PIT counter value	*/
static int   sysClkTicksPerSecond    =  100;   	/* default 100 ticks/second */
static int   sysTimerClkFreq = 200000000;       /* Timer clock frequency */
static short isInited = -1;
static long  previousJiffiesVal;
static long  virtualTickCounter;

asmlinkage long sys_prs_sysClkUtils(char * todo , int arg)
{
  long rc = -1;

  /* Test if the counters have been inited or not. These ones must be inited with jiffies value
   * but we can't do that at compile time cause jiffies is not a constant. Furthermore, we do not
   * protect these values with a semaphore cause only the sscManager uses it once. So there is
   * no concurrent access to them.
   */
   if(isInited == -1)
   {
      previousJiffiesVal = jiffies;
      virtualTickCounter = jiffies;
      isInited  = 0;
   }

  /* We want to make a sysClkDisable */
  if(my_strcmp(todo,"sysClkDisable")==0)
  {
        if(sysClkRunning)
	{
	   /* disable the PIT interrupt and auto-reload capability */
	   mtspr(SPRN_TCR ,mfspr(SPRN_TCR ) & ~ (TCR_PIE | TCR_ARE));
   	   /* clear the PIT counter */
	   mtspr(SPRN_PIT,0);
	   /* clear the pending PIT interrupt */
	   mtspr(SPRN_TSR,SPRN_TSR | TSR_PIS);
	   /* reset the running flag */
	   sysClkRunning =FALSE;
           rc = 0;
	}
	else
	   rc = -1;
  }
  
  if(my_strcmp(todo,"sysClkRateSet")==0)  
  {      
	if( (arg < SYS_CLK_RATE_MIN) || (arg > SYS_CLK_RATE_MAX) )
	   rc = -1;
	else
	{
	   /* save the new value for the system clock rate */
	   sysClkTicksPerSecond = arg;
	   pitCountVal = sysTimerClkFreq /  sysClkTicksPerSecond ;
	   mtspr(SPRN_PIT,pitCountVal);
           rc = 0;
	}
  }
	/* Bad use of this system call */	
	return rc;   	
}

/********************************************/
/* "montavista/include/linux/prs_sysClkUtils.h"
/* this is the header file for our system call
/* source file
/********************************************/ 
#ifndef __LINUX_PRS_SYSCLKUTILS_H
#define __LINUX_PRS_SYSCLKUTILS_H

/* We need the compiler to recognize the word "asmlinkage" */
#include <linux/linkage.h>

/* We need to access to powerPC registers */
#include <asm/processor.h>
#include <linux/sched.h>

#endif  /* __LINUX_PRS_SYSCLKUTILS_H */



/*********************************************/
/* montavista/arch/ppc/kernel/misc.S
/********************************************/
[...]	
        .long sys_clock_gettime
	.long sys_clock_getres
	.long sys_clock_nanosleep /* 240 */
	.long sys_prs_sysClkUtils

/*********************************************/
/* montavista/include/linux/unistd.h
/********************************************/
[...]
#define __NR_io_cancel		231
#define __NR_timer_create       232
#define __NR_timer_settime	(__NR_timer_create+1)
#define __NR_timer_gettime	(__NR_timer_create+2)
#define __NR_timer_getoverrun	(__NR_timer_create+3)
#define __NR_timer_delete	(__NR_timer_create+4)
#define __NR_clock_settime	(__NR_timer_create+5)
#define __NR_clock_gettime	(__NR_timer_create+6)
#define __NR_clock_getres	(__NR_timer_create+7)
#define __NR_clock_nanosleep	(__NR_timer_create+8)
#define __NR_prs_sysClkUtils	241
   
/***********************************************************/
/* "targetFileSystem/usr/include/sys/user_prs_sysclkutils.h"
/* this is the file added in the target file system to allow
/* user space progs to use the nex sys call
/***********************************************************/
#ifndef __USER_PRS_SYSCLKUTILS_H
#define __USER_PRS_SYSCLKUTILS_H

#include <linux/unistd.h>

_syscall2(long,prs_sysClkUtils,char *,todo,int,arg);

#endif

/*********************************/
/* User space program
/********************************/
#include <sys/user_prs_sysclkutils.h>
int sysTickGet(void)
{
    return(prs_sysClkUtils("sysClkRateSet",0));
}

Tks a lot

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